#include<stdio.h>
main()
{int a,b,c,count=0;
printf("There are different methods for XM to distribute books to 3 readers:\n");
for(a=1;a<=5;b++)
    for(b=1;b<=5;b++)

    for(c=1;a!=b&&c<=5;c++)
   if( c != a && c != b ) 
        printf(count%8?"%2d:%d,%d,%d":"%2d:%d,%d,%d\n",
                ++count,a,b,c);

//吴昌源
}